Yes that is the problem. For sure. I did notice I thought your small pulley was running too fast in your video. Star trails would absolutely be happening.
Also you should add to your signature that you are running asiair.
The reason I was asking about the firmware was to make sure you had not identified some issue with the new release.
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired